python dtest TestCqlsh added enable_scripted_user_defined_functions which breaks on 2.2

ERROR [main] 2020-07-26 03:03:14,108 CassandraDaemon.java:744 - Exception encountered during startup
org.apache.cassandra.exceptions.ConfigurationException: Invalid yaml. Please remove properties [enable_scripted_user_defined_functions] from your cassandra.yaml
	at org.apache.cassandra.config.YamlConfigurationLoader$MissingPropertiesChecker.check(YamlConfigurationLoader.java:146) ~[main/:na]
	at org.apache.cassandra.config.YamlConfigurationLoader.loadConfig(YamlConfigurationLoader.java:113) ~[main/:na]
	at org.apache.cassandra.config.YamlConfigurationLoader.loadConfig(YamlConfigurationLoader.java:85) ~[main/:na]
	at org.apache.cassandra.config.DatabaseDescriptor.loadConfig(DatabaseDescriptor.java:151) ~[main/:na]
	at org.apache.cassandra.config.DatabaseDescriptor.<clinit>(DatabaseDescriptor.java:133) ~[main/:na]
	at org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:604) [main/:na]
	at org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:731) [main/:na]]